(UNS C52100 | ASTM B103 | SAE CA521 | ISO 427)
92% Cu, 8% Sn, 0.1% P • Ultra-High Fatigue Strength • Precision Spring & Contact Alloy
Product Overview: The Spring Integrity Champion
When Medtronic engineers lifesaving pacemaker springs or Schneider Electric designs 500.000-cycle relay contacts, they trust C52100 Phosphor Bronze "8% C". This high-tin alloy delivers 2x the fatigue resistance of standard C51000 bronze, maintains elasticity at 200°C, and avoids the toxicity of beryllium copper. It’s why ISO 13485-certified surgical tools rely on it – ensuring zero spring relaxation where cheaper alloys fail.
Technical Parameters
| Property | C52100 Value | C51000 (5% Sn) | Beryllium Copper |
|---|
| Composition | Cu 91.5–92.5% | Cu 94–96% | Cu 97.5%, Be 2.5% |
| Sn 7.5–8.5% | Sn 4–6% |
|
| P 0.10–0.25% | P 0.03–0.35% |
|
| Fatigue Strength | 320 MPa (10⁷ cycles) | 180 MPa | 380 MPa |
| Tensile Strength | 690 MPa (HT temper) | 520 MPa | 1.300 MPa |
| Elastic Limit | 550 MPa | 380 MPa | 1.000 MPa |
| Electrical Conductivity | 15% IACS | 20% IACS | 22% IACS |
| Stress Relaxation | <10% (1000hr/150°C) | 25% | <5% |
Certifications: ASTM B103. RoHS/REACH Compliant (Pb-Free), ISO 1817. FDA CFR 21
3 Performance Advantages
Unmatched Fatigue Life
Survives 10⁸ stress cycles – critical for aerospace relays and cardiac device springs.
Stable Conductivity
Maintains 15% IACS even after 5 years in humid environments (per IEC 60068-2-30).
Toxicity-Free Alternative
Costs 40% less than beryllium copper without OSHA handling restrictions.
Engineering Superiority
Thermal Resilience: Withstands -196°C to 200°C (LN₂ to autoclave cycles).
Corrosion Immunity: Passes 720hr salt spray (ASTM B117) with zero dezincification.
Low Magnetic Permeability: <1.05 μ (MRI-safe for medical implants).
Anti-Galling: 0.06 friction coefficient against stainless steel.
Precision Manufacturing
1 Vacuum Arc Remelting
99.99% cathode copper + high-purity tin → oxygen-free ingots.
2 Hot Extrusion
850°C → rapid quench for homogeneous grain structure.
3 Cold Rolling
90% reduction to achieve Extra-Hard (H10) temper.
4 Stress-Relief Annealing
300°C/2hr → air cool for minimal residual stress.
5 Surface Finishing
Mirror polish (0.05μm Ra) for medical/electronic components.
Core Applications
| Industry | Critical Components | Standards Met |
|---|
| Medical | Surgical spring forceps, implant clips | ISO 13485. FDA 510(k) |
| Aerospace | Relay contacts, flight control springs | MIL-B-13926. AMS 4598 |
| Electronics | Connector pins, MEMS switches | IEC 60352-1. EIA-364-65 |
| Automotive | Fuel injector valves, ABS sensors | IATF 16949. SAE J461 |
| Energy | Circuit breaker arms, turbine brushes | IEEE C37.100. UL 486 |
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